rs1556880284

chrX-53320972-AGCTGGCCCTCCAGCTCCTCGATGCGCCGCCGCTGGGTTTCCAGCAGCTGCTGCTGGCTCTCGATGATGTTGTTCAGCTCCAGCAGGTACTCCACGGC-AAT

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_001111125.3(IQSEC2):c.55_151delinsAT(p.Ala19IlefsTer32) variant causes a frameshift change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. A19A) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 21)
• Consequence: IQSEC2 NM_001111125.3 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 5.96

Genes affected

IQSEC2 (HGNC:29059): (IQ motif and Sec7 domain ArfGEF 2) This gene encodes a guanine nucleotide exchange factor for the ARF family of small GTP-binding proteins. The encoded protein is a component of the postsynaptic density at excitatory synapses, and may play a critical role in cytoskeletal and synaptic organization through the activation of selected ARF substrates including ARF1 and ARF6. Mutations in this gene have been implicated in nonsyndromic X-linked cognitive disability. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Aug 2011]

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 110 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-53320973-GCTGGCCCTCCAGCTCCTCGATGCGCCGCCGCTGGGTTTCCAGCAGCTGCTGCTGGCTCTCGATGATGTTGTTCAGCTCCAGCAGGTACTCCACGGC-AT is Pathogenic according to our data. Variant chrX-53320973-GCTGGCCCTCCAGCTCCTCGATGCGCCGCCGCTGGGTTTCCAGCAGCTGCTGCTGGCTCTCGATGATGTTGTTCAGCTCCAGCAGGTACTCCACGGC-AT is described in ClinVar as [Pathogenic]. Clinvar id is 545445.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
IQSEC2	NM_001111125.3	c.55_151delinsAT	p.Ala19IlefsTer32	frameshift_variant	1/15	ENST00000642864.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
IQSEC2	ENST00000642864.1	c.55_151delinsAT	p.Ala19IlefsTer32	frameshift_variant	1/15		NM_001111125.3	P1

Frequencies

GnomAD3 genomes Cov.: 21

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 21

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Intellectual disability, X-linked 1 Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Equipe Genetique des Anomalies du Developpement, Université de Bourgogne

Feb 15, 2017

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Computational scores

Source: dbNSFP v4.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1556880284; hg19: chrX-53350171;